Yes, there are muscles--pelvic floor muscles--inside the pelvis that control bladder and bowel function and keep all the organs in place. They surround the vaginal canal, and control the tightness. A female orgasm occurs when some of these muscles involuntarily spasm. Childbirth, hormone levels and time can loosen these muscles, and Kegel exercises* can strengthen them as well as help with urinary incontinence.

There are disorders where these muscles are too tight and cause pain with sex and also bladder issues. If you are having issues, your gynecologist can help and refer you to a doctor that specializes in pelvic floor muscle issues.

Using lots of lube and going slow will help stretch out a too tight vaginal canal. A dildo is a great tool to help loosen a canal that is too tight for penis penetration. The vibrations help relax the muscles. You can use a dildo to open up the canal just prior to penetration to make sex less painful. If pain persists, go see your gyn. Sex shouldn't be uncomfortable. Pain is a sign of something being wrong.

*kegel exercises
The best way to figure out how to do a kegel correctly is the next time you go pee, try to stop the flow of urine mid stream. Feel the muscles you are using to do this. Once you figure out which muscles to contract, you can do kegels anywhere. Do a couple a few times a day to help strengthen these muscles. If you muscles are already very tight, do a kegel and then concentrate on relaxing the muscles as much as possible. You may notice that these muscles get tensed up involuntarily, so practicing to relax them will help loosen you up.

Doing kegels during intercourse is a fabulous sex technique. Squeeze as tight as you can and hold as long as possible. This will drive your man wild.

I myself am worried about this. My own vagina is too tight to fit a penis...I use a small deoderant bottle (tough glass, plastic 'top') to get myself off anally, but it won't even fit in my vagina...my boyfriend and I have done anal sex but vaginal is out of the question and it bums me out. Anything that can be done (other than 'relaxing' or 'easing it in') or will this require medical attention when I am older?